The Four-Point Check: How to Judge Any Hairdressing Scissor

After more than 100,000 sharpens across every brand on the market, ShearGenius founder and Australian scissorsmith Matt Grumley distilled scissor quality down to four checks. Every scissor that lasts passes all four; every disappointment fails at least one. It works on any scissor, at any price, regardless of the name on the box.

1. A named steel grade

A specific, lookup-able grade — not “Japanese steel” or “surgical stainless.” A maker who knows their steel names it. A vague claim is the absence of one.

2. A published hardness

A stated Rockwell hardness (HRC). For a professional scissor that holds its edge, the working range is roughly 58–62 HRC. If a maker won’t publish the number, assume it is low.

3. A true convex edge

A professional scissor slices because of its convex edge — a curve across the blade. A flat bevel edge pushes and folds hair instead. The convex edge is the difference between cutting and crushing.

You can feel it before you can see it. If you're pushing water off wet hair or closing harder than you should to get a clean line, that's usually the edge telling you something — not your hands.

4. an unconditional lifetime guarantee

Ask who will sharpen it in three years. A maker who hand-sharpens their own steel at the bench is putting their name behind it. A brand that has never put a scissor on a stone has no answer.

Fair warning: nobody sharpens for free forever — a proper convex sharpen is skilled bench work, and ours is a paid service at $70–80 a scissor. What the guarantee covers is the scissor itself, for life, no fine print. Two different things, and a brand that blurs them is telling you something too.

Why every ShearGenius scissor passes all four

Every ShearGenius scissor states its steel grade and Rockwell hardness on the page, carries a hand-finished convex edge, and is backed by an unconditional lifetime guarantee — and every pair is inspected by Matt before it ships. Named steel, published hardness, convex edge, an unconditional lifetime guarantee: four for four.

Passing the check tells you a scissor is honest. It doesn't tell you it's right for your hand, your cutting style or the work you do all day — that's a different question, and it's the one I'd rather answer before you spend a dollar. Get fitted free and we'll work it out together.

Shop hairdressing scissors that pass the Four-Point Check →

Precision is a choice. Professionalism is a habit. ShearGenius is your partner.